Cutting machine



Nov. 18, 1930.L .1.A .1. PoNDELlczEK 1,781,703v

CUTTING MACHINE Filed 89V. 14. 1922 6 Sheets-Sheet l Nov. `18, 1930.

J. J. PONDELICEK CUTTING MACHINE Filed Nov. 14, 1922` @sheets-sheet 2CUTTING MACHINE Fi1ed` Nov. v14, 1922 6 Sheets-Sheet 3 Nov. 18,1930. J.J. PoNDELlcEK CUTTING MACHINE Filed Nov.

14, 1922 6 Sheets-Sheet 4 {@wmwmu,

` NOV. 18, 1930. I IPONDELICEK 1,781,703.

CUTTING MACHINE Filed N Ov. 14. 1922 6 Sheets-Sheet 5- Nov. 18, 1930. J.J. :PoNDLlcr-:K

CUTTING MACHINE Filed Nov. 14, 1922 e sheets-sheet e Patented Nov. 18,'1930 JERRY J. PON'DELIGEK, 0F cI-IIcAGo, ILLINOIS, AssIG-NQBL, BYAMEsNEASSIGNMENTS,

To ACMEY MOTION PICTURE IRQJECTONCOMPA'NY, or oHIonGo, ILLINOIS, A coR-l :PoRATIoN or' ILLINoIs CUTIINe MACHINE Application ledpNovembe'r 14,1922. i Serial Ne.`600,832. y Y- This invention relates broadly 4tometal vvorlring and especially metalcutting'and.

turning, more particularly to an improved apparatus `for cutting metalor the like-,tor ...constructing cams and other articles *havingAyspecial shapes. 'f

lhile this invention, for Vthe vsake of conf` venience, is illustratedasf embodying apparatus especially adapted forcutting a ypar- ;ticularstyle and shape of cam, it Will Ahe readily understood that theinvention is not; limited to manufacturefoffthis .particular type `ofcam only, but'iinds a Wide ieldxof utility forotherpurposes. A

The principal objects and .l advantages Which characterizethis inventionreside in:`

theprovision of an improved method ofand apparatus for.y Working metal;the lprovision of an improved methodof and apparatus'for WorkingV.1n`etal-, which, While. especially adaptedfor cutting cams in metal,may-.be

' employed equally asWell for Working other material; the provision of`improved apparatus for cutting a special `type or types of cam; theprovision of Yimproved apparatus" forcutting a camv or series of cams,and 1n Which, the cutting-mechanism is automatically controlled fordepth and pitch of cam independently of theoperator .except aforprovision of improved apparatus Which is characterized by theprovision'of improved means y'whereby ya cutting tool maybe set.V

for cuttingy a cam ofl predetermined length I and pitch, and whichretains itsgadjustment throughout the manufacture of a number .of

such cainsor other articles beinglnade; the provision of improved camcuttingapparatus possessing the e characteristics*pointed out yabovewhich'is simple and, compact in struc-r..V ture, readily-portable,and highly flexilo'leinv operation.

,'lhe'`clevice ofthe present'invention has* been designed for thepurposev ofmmanufac-r turing"y accurately yand rapidly in largelqua'n#tities a specialcanivvhichk forms the subject :inatter ofniyY co-pendingapplicationA Serial No.1 592,400, but' which camis not,.in detail,

to be: considered a part `of. the present invention; and v to this `endthe apparatus here.-

Vinai'ter described and illustratedinthe ac# companying drawingsincludes means for supporting thework, or kpiece of metal on Which thevcamf is made, ank vimproved tool holder Whichis angularly* displaceablerelative the Work fork removingthe requisite*l amount. .of vmaterial'therefrom, or otherwise eecting the shape of the article Worked upon,`ingorder ton produce thereon integral cam or cams possessing v'thedesired charac-y teristics; the provisionof an improved pattern Wheelfrom Which the cam-shape is de'- f.

termined.; and the provision ofl an improved timing v,apparatuslWhichimay be .modified 'as desired for producingI the required?relative movement betweenthe cuttingtoolandthe Worlr;tlie provision ofiinprovedmeans for properly adjusting the tool `for afffirst cut, andorpther necessary adjustments;` and. the p'royisionof 'improved means.for supplying-lubricantto fthe' tool; and Work;;the"

operating inechanismof the device .,Which controlsthe degreeofrelativemotion be- .tween the Work and the tool, being'entirely manualadjustment at startof,cutt1ng;vthe

automatic and operating independently of `the controlof the operator, sothat the human elei'nentfinvolved in the actual cuttingy off the cam, orother element 'being' formed, is'. quite, `iiinotentirely.eliminated,-th11s makinggfor speed and accuracyz.

. This invention is Vfurther. vcharacterized byy thev provision of meanswhich permits of use of various sizes andv shapes of cutting toolsandwcontrolling pattern elements, whereby cams and similar mechanicalpartshaving vayand thef'ap'paratus thus gprovided'aii'ords means forproducing various articles in'metal having `special shapes.

Th foregoing Objects and advantages; 512

,90 rions sizes, shapes'and degrees of curvature,

` gether with such other objects and advantages as may hereinafterappear or be pointed out, are attained in Lone structural embodiment ofthis invention, illustrated in the accompanying drawings;

Flgure'l isa side elevatlonalvlew of a metal cutting apparatus embodyingthe im-` provementsof this invention;

Figure 2 is an enlarged fragmentary elevational view 'ofthe cuttingmechanism and operating means therefor;

Figure 3 is an enlarged fragmentary end elevational View, viewing themachine from the aspect of the left hand end of Figure 1; Figure Llis atop plan view;

Figure 5 is. an enlarged longitudinal vertical sectional View taken onthe plane of the 5,' looking 'in the direction indicated by the arrow; Vv e y v,Figure is an enlarged longitudinal sectional view of the toolholder taken on the e Y inthe direction indicated by the arrows;

plane ofthe line 10-f10 of Figure 2,V looking yFigures 11 and-.12aretransverse sectional views taken on the planes of the lines 11-11 and12--12, respectively, of Figure 10, e

Figures 13V and 14'are sideV and end elevational views,respectively, onan enlarged scale, ofthe cutting tool, and

Figure `l5.isa detail sectional view of the w'ork'holder.`

kThis invention, as structurally Adeveloped in thejpresent embodiment,includesapparatus for driving a cutting tool having specialcharacteristics tojbe hereinafter pointed out, means for imparting theproper amount ofv motion at a proper speed to thev work, and

means for displacing the cutting device an- Vgularly with respect to thework for performfurthermore includes various adjustment fea? tures,whereby whencutting cams, various lengths of camand degrees of. pitchofthe cam-may'be'made. f v I ",Referring more particularly to thedrawings,the apparatus of this invention includes the bench or platform5,which affords a base upon which the cutting mechanism general` lydesignatedC is mounted, said base being su ported on` suitable pairs oflegs 6 and 7 he"11egs'6 and?y are arranged tofsupport sectional kview ofa ing certainv operations thereon;V The device- Illustrated `1n theaccompanying drawingsV at a proper height, a platform 8, on which ismounted an electric motor 9, or the like, for driving the cuttingmechanism, said motor being connected with a pulley 10 mounted on ashaft 11, a second pulley 12 also being mounted on said shaft.v Acentrifugal pump 13 is mounted on the platform 8, and said pump isdriven by a belt-14 trained over the pulley` 12. The centrifugal pumpremoves liquidlubricant contained in a tank 15 and forces such lubricantthrough a conduit 16 to a desired point on the cutting mechanism forlubricating the tool. A tray 15l catches the usedlubricant and conveysit thro-ugh a tube 16a to the tank 15.

The cutting mechanism and operating'and control mechanism therefor areVmounted upon a base frame F, which is providedwith a bottom flange 17,secured to the platform 5 kbythe provision ofl bolts 18-18. The frame Fis provided with a flat horizontal portion 19-` forming the top thereof,and on said top 19, ina proper position, there is mounted a carrying`frame F', which comprises the base portion 20, vertical web 21, guideweb 22 at substantially right angles to the web 21, and bearing sleeve23.

Inthe sleeve or bearing element 23 there is revolubly mounted aA shaft24, said shaft projecting beyond the ends of saidV sleeve as shown at 25and 26, the projecting portion 25having a cam wheel 27 i'iXedly securedthereto, and the portion 261havinfr a clutch head 26aiiXedlysecuredthereto. The work is seen" at 28, Figures 1 to L1,inclusive, and the element here shown to be 'worked upon takes theform'of a circular disk provided with a cylindrical surfaced 29 andinterrupted by ain enlargement 30, in which aspecial cam is to be cut;

While this ,apparatus may b e employed for various purposes related tothe art of metal cams `similar to that described and claimed in myco-pending application Serial No.`

The disk 28 or other work-is secured fixed# ly tothe end 26 of the`shaft 24. The clutch head 26 is provided with parallel pins 32 whichareV adapted to engage in complemen tal openings 33 in the work, wherebyto cause Vthe work tofrotate with the'shaft 24. Of

placement of the hinge bracket 341 of the weby 21', and as ,the bracket34 is slotted at 21%, it maybe adjustedvertically onsaid web.` Theybracket 34; is `provided with spaced colil() turning and Working, moreparticularly to the `formation of special cams, 1t is here illuss tratedand described as employed in cutting lil!) ignated D Vand comprises asingle casting! 1,1781 ,vos

axially .iapertured 'ears 87 adapted to receive n' avportion of astationary shaft 38, 'which lat-` ter'serves asa hinge pintle andalsosupports scribed.

The'tool holding frameV is generally de-` niotion transmitting meanshereinafter. de

Whichis characterized. by the provision o-f a Web or barl 39 'extendingparallel to and lon.- gitudinally'of theshaft 38, said Web beingprovided .With an `apertured lug 40for engagement Withv the 4shaft 38andalso serving.

to integrally connect a partv41'ofan adjust-3- y ing device, describedlater,fand a bracket `4B,

' of the shaft 38 and provided With a hub pori 38.. The tool holder 42ris `carried byv the part 4l.A Theframe Dis, thus, With the-tool 1holder,42, adjusting fde'vice. 41,. and bracket the, latter being arrangednear :the outer end tion 44 adapted to: axially receivetlie shaft43angularly' displaoeable on the web 21 for apurpose Which Will.presently appear. The Y bracket 43` is provided Withan extension 45,

the latter having ya. shoulder ,46;.auzlaptedto engage the top surfac'e48 of the guide Web` 22 for limiting the movement of the frame.

D in one direction.

arranged against displacement therefrom by theprovision of adove-tailptongue and slot 50, as best seeng in VFigure 3. The cross"-head 49 lis .providedwith an upstanding lug 51, anda'connectmg` rod orlink 5,2 is pivotally connected. atV 58 and 54f\vith the exten-V t y r lcarriedxin the outer end-ofan arm 79 pivoted.

lsion 4K5 and lug 51.

` thelcam Wheel 27, .and-said cross-headisi Thecross-head 49 extendsbeyond the end.:A

of the guidev22, across ythe peripheral faceA of reduced as at 55 yandrprovided withy airin-y wardly extended ant1f r1ction roller 58,

' which latter is adapted to engage in peripheral grooves 57 .and 58provided Wheel `27.

.The grooves 57 ,and58 areconnected yto form asingle continuous groovehaving terr'l minals at 59and 60, respectively, by cutting away portionsof the groove and inserting an arcuate plate section 61 provided with asinuated groove 62,' the ends ofivhich latter join .thegrooves "57 and58, as yshown at 62` and .63, respectively, in Figure The .plate 6l; isremovably secured Ain proper posi-tionV onthe peripheral faceof theWheel27joy the p roi-*ision o'f'a pluralityk of l.series of marotatedtheycross-head 49 Will be caused toV reciprocate in its guide and thus,angularl;T

displace the frameDir It isintended'that thelplatel he readilyremoyableso it.

may-be replaced by other plates having 'dirI` on thel cam'4 y v n saidbracket. 48;V rAvn'ut 85, retains the vbolt in a position to Whichsamehas been moved.`

rangement.y shown provides for displacement of the 'frame D-.through anarcof 90 degrees Motion through va part `of .a revolution is imparted.:to the Wheel 27 by the provision i f of amanually or otherwiserotatable shaft 65,1

arranged at right angles Yto the shaft 24,.be-

low the. latter, in suitable bearings 66 on Vthe frame F said shaft `65having a Wormx67 which? meshes with a Worm gearl68," fixedlysecuredtothe projecting end 25,0f the shaft 24, between'. theyy Wheel'27 and .the adjacent l endpf tlie-,bearing23,j. `The outen end of the.,`shaft6f5 isprovided Witha hand Wheel. 69.1.5k

Referringfno-W to thecutting mechanismJ anddriving means therefor, thereis provided .the tool holderv 42, *inl Which the. toolT isf revolublymounted, fthe detail 'structurer` of thetool holder and tool beingdescribed later., Motion i imparted tothe tool in the proper:

direction bythe provision-of;agpulley v axially mountedfonthetoolholder, idling pulleys@ and 72,. drivingpulleyf73, and a f belt 7 4trained` over all of said pulleys; The

pulley is loosely mounted on the. shaft38 and is fixedly connected Withva relatively4 large pulley having a belt 76 trainedthereover, WhichbellV Y A mounted on thearmature shaft 77 ofthe mois also trainedover aipulley .tor 9. l, AThe pulleys@ and 75 are held against.

longitudinal displacementv on shaftBS, theprovision-of a sleevevf78a,1and the hub'86 of' counter-balancearm 87, which is fixedly.

securedttofshaft38. A Weight7 is carried the. arm 87,and isadjustable'thereon. ,y The pulleys 71v and 72 are carried indirects.. lyby thebracket 43, said pulleys beingr mounted upon the extremities of ashaft-7 8 on'. a l.pin 80 which. extends :transversely throughl thebifurcatedend. ofthe ,bracket 43, saidl arm`79 being. angularlyadjustable.V

in'said bracket' 48 the provision of a bolt 83 which impinges upon-onesurface vof the arm Y 79Ja`nd. passes ,through a strap .84 secured to g.Referring nov7 to the tool holder andad .justablesu'pport therefor, Iprovide a singlevr :E including: a supporting yoke 88,

casting L K slidev block 89 on Lsaid yoke, andy thetool holder-.42.. Theslide 89, as bestshown Figures` 6, 7 and l8,-is provided With a dove-l itailvfslot orgroove 90, which isadaptedto' receive v they complementaltongue y91 formed on Ythe bracketl41. A` Wearingr and 'friction plate;92l isv placed. betweenl one. surface of.-

the tongue `91 and theladjacentwall vof `the the; non;

The pinion, 95 -isf d a bearing 97 in the block 89, and a knurled wheel98 `is fixed on the outer end of said' shaft, whereby the. latter may berotated for sliding the 'block 89 in the' support 41.

`In order to limit-downwardmovement of the block 89, the latter isprovided with an arm 99, which overlies the upper end of the support 41,lsaid arm having a set screw 100 arranged therein for impinging upon theabutment 101 on the bracket 41. A knurled portion 102 serves foradjustment of the screw,

Vand a nut 103. locks said screw. As the toolV holder 42 is integral.withor otherwise secured to the block`89, it is obvious that adjustmentof said block results in similar adjustment of the tool holder.

The tool holder structure, which, of course,

K isexemplary of but one manner of obtaining with a ing the desiredfunction and result, is best .illustratedl in Figures 10, 11 and 12. Thetool holder comprises the preferably cylindrical hollow part 42, shownintegra-l with the yoke 88, andV provided with an outer reduced eX-ternally threaded portion 107 The cylinder, 42receives a lon itudinallyadjustable sleeve 108, .said sleeve aving rack teeth 109 meshupon ashaft 111, revolub'le in a bearing 112, and manipulated by the knurlednut 113, best seen in Figure 11.

'Ifheloorev 114 of the sleeve 108 is'tapered, with its larger diameterpresented toward the vtool T, and saidsleeve receives the tool holdingmandrel 115, which latter has a portion 116 ofits external surfacetapered to fit said sleeve 108.; The mandrel 115 is provided fwith anenlarged head 117, said headv Vabuttin a wearing washer 118, placedbetween tie head and the adjacent end of the sleeve 108. vThe mandrelisV externally threaded at 1119 and there Vreceives two or more threadedlock and wear Iwashers 120-120, which latterabut the innerv endof thesleeve 108. The sleeve108 is heldagainst movement by the provision of aWingnut set i screw 121, passing through the part 42 into` engagementwith said sleeve.

VAs 'will be seen from Figure larged head 1 17 and the nuts 120cooperate to permit Vof rotation of the mandrel in the sleeve 108, butprevent longitudinal displacement of such .mandreL YThe mandrel projectsthrough Jthe outer end of the holder 42 and is provided with an externallongitudinal key-way`122, the pulley being mounted,V directly upon thevmandrel 115, said pulley having its-axial. bore enlarged for receptionof the: reduced portion 122a of the collar'124.

Thepulle is fixed for rotation with the mandrel'115` y `the provision.of a `'key 1 23,fit-

ting in saidYkey-way 12,2.` Y v collar 124 is receivable upon The'`adjusting the "mandrel, within ,theflholder 42, anda knurled nut 125 isfixed .to said collar by a pressfit.` "The nut 412'fen'gagesthethreaded' pinion 110. The pinion is `fixed io, the @nl part 107 ofthe holder 42 for adjusting said collar 124, and a set screw 104 holdsthe collar against movement when set.` A collar 105 abuts the outersurface of the .pulley 70 and a set-screw 106 holds said collar on themandrel, the inner surface of the pulley abutting the collar-124. Y

The mandrel is 'provided with an axial bore 126, said bore being reducedat 127 and flared to form a socket at 128 for receiving the shank 129and taper 130 ofthe tool T, respectively. As best seen in Figures 12 and13, Vthe tool shank has a `longitudinal keyway 131 Vfor reception of akey 132 fixed in the reduced part 127 of the mandrel bore,

and the free `end of the tool shank is threaded at 133 for engagementwith an axial threaded` opening 134 providedin one end of a tool lockingrod 135, Which latter lies in the bore 126 of the mandrel'and has anexternal abutting nut 136. When the tool is inserted and engaged withthe rod 135, the latter is rotated until the tool is firmly seated inthe mandrel socket, the key 132 and said lock rod cooperating to preventdisplacement of the tool. i j

The tool cutting head may, of course, take any suitable shape,dependingupon the work to be done, but ashere employed and as best shown inFigures-13 and 14 takes the form including two oppositelyV taperingcutting faces 137 and 138, composed of radially disposed blades 139 and140, respectively. TheV blades 140V are, of course, continuations of theblades 139. The angularity of the two faces 137 and 138, with respect tothe longitudinal axis of the tool, is preferably 45 degrees, but, ofcourse, may be varied as required. Y j j The tool holder 42, and theblock 89 are so angularly related, that, when the block is verticallydisposed, as seen in Figure 2, the tool holder is disposed at an angleof 45 degrees. The arrangement of the tool holder is "also such thatprior to or during a cutting operation, a center line passingtransversely through the area of the work to be cut, or a transversecenter line of the disk 28, extends exactly through the center -of thetool cutting head. This can best be seen from an inspection of Figure 2.

As previously pointed out, the tool holder andthe tool carried therebyare adapted to be angularly displaced, in the present embodiment,through 'anarc of substantially 90 degrees,` and the limits of movementof the t'ool holder through its arc of displacement are indicated by thekdotted lines X and Y,

center of the workvall coincide as 1previously cylindrical surface 29rof the work.V `The conduit 16 terminates in a downturned spout 14ajustabove the tool so that lubricant issuing from said spout isdepositedupon the tool.

` In operation, assuming that the machine is -to be employed in makingythe special cam hereinbefore referred to, the work isfsecured to` theyshaft 24 as previously explained.

' Prior to this step, the'cam wheel 27 has been f-providedwith thepr-oper grooved plate, in ythis instance,- that previously described,land designated 61.; As shown in Figures 2 and 4,'the machine is readyfor a cutting operation, vthe cross-head roller 56 being, atrthis time,disposed inthe outer of theV grooves on the/cam wheel'27, namely thegroove57,

`near ythe terminus'59 thereof.

The tool T, having been placedin the tool holder, is brought into theproper positionl for'cutting, namely, with'its .front cutting faceinengagement with the face 29 of the disk 28 byproperly adjusting thesleeve 108, nut 125, and collar 105. Further adjustment maybe obtainedby the vertical displacement Vofthe block 89'. This 'adjustment is hadby releasing the block 89 so that the same may 'beioperated by theyknurled nut 98.v

The tool holder being in theposition shown in Figures' 2 andj4, the setscrews. l121 and N106 'are'l released, and by manipulation of the nut113the sleeve 108 is moved so as `to bring the front cutting face137--of the tool into. proper engagement with the face 29 of vthe work.

This adjustment is permitted by rvirtue of the release of thecollar-'lOfrom engagement with the mandrel'll, and when the tool is in the properposition, the set screw 106 is again tightened so that the pulleyv 7 0is maintained in abutting engagement with the "collar 1245.

The set screwV 12,1 is then tightened rand the device is ready forcutting. operation. The

nutl25 permits of finer adjustmenty than that permitted by the rack andpinion structures 109 and 110. For instance, if the Vsetscrews 121 and104- are' released, and4 the nut 125 turned in either direction, theabutment` collar 121i will be displaced in order to finely adjust thetool. The collar 105 isthen yadjusted to hold the pulleyY in properrunning position against the abutment collar 125, Such adjustment, ofcourse, displaces the pulley slightly, but not suiic'ientlyto cause thebelt When the tool has been properly adjusted and the holder secured inproper adjusted position by tightening the set screws121- and 1:04, t-heentire holder may be vertically displaced 'by manipulation of the nut 98, so that when taking `a first cut ofi' the work, that is, when firstremoving a part ofthe enlargement 30,',or when workinga'deepv cut in thework, the tooljmay belifted toy thetop ofthe'en- Y holder returns'tonormal position.A

largement and the motor started so that a first previous position, andthe set screw 93 is then tightened. 9 .f

The motor 9 is again started, and the tool, revolving `at a rapid rate,is introduced into engagement with the enlargement 30 by im-y partingmotion manually to the hand wheelv 69 in the directionof the arrow shownin Figure 1: vThis motion vperforms two functions, namely, produces acircular displacement of the work and the enlargement 30 past the .toolT,- and simultaneouslyimparts rotation tothe cam wheel 27 in thedirection of the arrow'27a, VFigure 3, thus causing relative movementbetween the Vgroovef57 and the roller 56.- Continuation of rotation ofthe cam Wheelv through a complete double revolution, that is, 'onerevolution through they groove 57, then transfer of the roller to thegroove 58, and one revolution in the latter groove, producesreciprocation of the cross-head 49, and consequently displacement of theframefD through degrees. Thismeans that the tool holder 4:3 is displacedfrom the positionrshown in Figure2, through the position shown inFigvure l, to the point indicated by the dot-ted line f Y, in Figure Y1.Rotation of the work and displacement of the tool are so timed that thetool commences to move from the position shown in Figure 2simultaneously with the'arrival at the tool ofthe enlargement 30. 1

- The angular displacement of the tool holder and the frame D isaccomplished against the action of the'weight 7 5, and consequentlythemotion-of the frame is balanced. Furthermorerlthe weight facilitates thereturn ofthe tool holder to normal position, and permits ofa reverse cutbeing made. It will be readily observed that in some instances the camto be formedonthe disk 28 may be produced by one operation ofthe tool,but where the-cut required in making thecam is' too deep' for oneoperation, the machine may be put through twovor more cutting steps,each step making a slightly deepercut in the enlargement 30. This may beaccomplished by ma- `nipulating the block 89' for each cut, and it willbeobserved that 4by reversing the direction of rotation of the wheel 69and bylowering the vtoolfor each oscillation, a cut may be made whenmoving the tool holder downwardy lv and anothercut may be made as j thetool By placing plates having different curvatures kof grooves on thecam Whcel'27, Aor by placing two ormo're of such plates on the wheel 27I amenabled to form a series of cams, on the Work, andv thesey cams maybe placed either reg'rularlyv or irregularly about the disk 28. Ofcourse, theforging from :whi'chthe camdisk ismade is provided withthefrequired-number of enlargements. kFurthermore, by placing two ormore plates, similar to that designated 61, upon the wheel 27, but withgrooves relatively reversed, I am enabled to form cains in series uponthe disk,said cams being relatively reversed, or if desired, the camsmay have relatively differe'nt pitches. `For instance,'it `'may bedesiredvto produce a vcam disk having two or more sets of cams thereonwhich are adapted to impart motion in the same direction and at`relatively different speeds, which requires cams having differentpitches, or if desired, the series of cams may be arrangedinsetsof twoor more,`and the units of each-.set may `have the same or different`pitches and may be constructed to impart motion in the sameor'different directions whenA in use; Thus, itwill be readilyobservedithat I do not limit this invention to the production of anyspecific size, shape, or pitch of cam, and that all the featuresreferred to'may be carrieduout -Without lin the least modifying vthebasic method of operation of the device. In fact,

the tool shown is entirely adequate for form- 'substantiallytangentially to the periphery of said object and in a plane radiallyofsuch object, said means operating to displace the tool relatively to theobject in a curvedpath during cutting and without disturbing the radialrelationship of the tool and object.

y 2. In a devicerof'the character described, in

combination, a work support, and an object thereon adapted to berotated, and a tool holder which is angularly displaceable with .respect`to Vthe object about a' center' point located within the confines ofthe periphery of the obj ect rotated, and a tool having itsworkingsurface entering said periphery. Y

3. Ina device of thecharacter described, in

combination, a work support, and an object thereon adapted to berotated, `and a tool holder vwhich -is angularly displaceable withrespect to the object about a center point locatedwithin the confines ofthe periphery of the object rotated, and a tool having its longitudinalaxis disposed in a plane radial with vrespect to said object' and havingits working surface entering said periphery. .4. In a device of thecharacter described, 1n

,colnbination, a worksupport, and an object thereon adapted toiberotated, 'and a tool holder vwhich is angularly displaceable with 05respect tothe object about a center point lo- `cated within the continesof the periphery. of

the object rotated and; an automatically angularly displaceable toolhaving its working surface entering said periphery.

5. In a device of the character described, in combination, a worksupport, and an object thereon adapted Vto .be rotated, and a toolholder which is angularly displaceable with respect tothe object about acenter point lo- .catedwithin the confines ofthe periphery of the objectrotated, a tool having its working surface entering said periphery, andmeans foradjustingsaid tool on. its longitudinal axis withoutsubstantially disturbing its angular relationshipto such periphery. i

. 6. In a vdevice of theV character described, in combination, arevoluble tool, said tool having a plurality of, contiguous cuttingfacesangularly related, and means for angularly displacing said tool forpresenting first one and then another of said faces in succession by a`continuous motion to an object to be cut.

In al device ofthe vcharacter described,

in combination, a tool having an, `angular cutting head and adapted tobe revolved, and means for presenting said tool continuously in contactwith an' object to be cut and for simultaneously angularly displacingsaid head with respect to said object about a center located in theperiphery of said object.

` 8. .In a device of the character described, in combination, arevoluble tool having an angular cutting head, and ,means for presentingthe faces and corners of said tool to an object to kbe cut. A

9. Ina device of the character described, in combination, a revolubletool having `an angular cutting head, and means forV successivelypresenting the faces and cornersof said tool to an object to be cut. -A10. In a device of the character described, in combination, a revoluble`tool having an angular cutting head, and means for presenting one of thefaces of the tool and then an angular portion of the tool to an objectto be cut. Y Y

11. In adevice of the character described, invcombination, an objecttobe cut, a tool having an angular cutting head, means for'presentingsaid tool continuously in contact with said object and forsimultaneously displacing the tool about a centerrlocated in 4saidobject, andmeans for simultaneously rotating said object with respecttothe tool.

12. In a device of the character described, in combination, an object tobe cut, a tool having an angular cutting head, means for presenting saidtool continuously in contact with said object and for simultaneouslydisplacing the tool about a center located in said object, and means forsimultaneously at a given ratio of speed rotating said object in acurved plane. L v

13. In a device of the character described,

in combination, a Work holder, a tool holder disposed-normallyin a planeradially disadapted to support posed With respect to the axis of saidWork Y older, and means for angularly displacing said'tool holder insuch a plane Without disturbing the radial distance between cutting headof the tool carried by said tool holder and the axis of said Workholder. 1

15. In a device rof the character described, in combination, a toolyprovided With a cutting head having oppositely tapered cutting faces,and means for concurrentlylpresenting both of said faces to van objectto be cut.

16. In a device of the character described, in combination, a toolprovided With'a cutting head having oppositely tapered cutting faces,and means" for angularly displacing the tool presentingone and then theother of said faces to an object to be cut.

17. In a device of the character described, in combination, a toolprovided with a cutting head havingoppositely tapered cutting faces, andmeans for presenting said cutting faces successively and Withoutinterruption to an object to be cut.

18. In a device of the character described, in combinationa rotatableWork holder, a pattern rotatable on an axis coincident with said yWorkholder, said Work holder being adapted to support an object to be Workedupon, a tool holder arranged with its axis initially parallel to theaxis of said Work holder, .a tool supported by said tool holder andhaving its cutting surface engaging theV peripheryof the Work carried bysaid Work holder and means for displacing said-tool holder angularlywith respect to the axis of said Work holder in a plane radiallythereof.

19. In a device of the character described, in combination, a rotatableWork holder, a pattern rotatable on an axiscoincident with said Workholder, said Work holder being an object to be Worked upon, a 'toolholder arranged with its axis initially parallel to the axis of saidWork holder, a tool supported by said tool holder and having its cuttingsurface engaging the periphery of the Work carried by said Work holderand means for displacing said tool holderangularly With respect vto theaxis of said Work holder in a plane'radially thereof, said means beingoperated by said pattern.

20. In a device of the character described, in combination, a rotatablevWork holder, a pattern rotatable on an axis coincident With said Workholder,-'said Work holder being adapted to support an object to bevWorked upon, a tool holder arranged with its axis initially paralleltothe axis of said work holder, a tool supported by said tool holderyand having vits cutting surface engaging the periphery of the Workcarried by saidv Work holder and ymeans for displacing the Work holderrincluding a `reciprocating member operable in a path parallel to theaxisof saidwork holder and connected tobe operated by said pattern. ;v

In testimony whereof I lhave `hereunto signedmy name.

v.JERRY J. PONDELICEK.

no y

